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        IDEA项目启动崩溃，控制台没有错误信息问题
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    <p>idea中项目以线下环境启动，程序启动失败，项目无法访问，控制台打印部分日志如下</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">2020-01-06 19:35:55.170 | INFO  --- [RMI TCP Connection(3)-127.0.0.1] |      org.hibernate.validator.internal.util.Version :30   | HV000001: Hibernate Validator 5.2.4.Final</span><br><span class="line">06-Jan-2020 19:35:57.481 SEVERE [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal One or more listeners failed to start. Full details will be found in the appropriate container log file</span><br><span class="line">06-Jan-2020 19:35:57.484 SEVERE [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal Context [] startup failed due to previous errors</span><br><span class="line">2020-01-06 19:35:57.478 | INFO  --- [RMI TCP Connection(3)-127.0.0.1] |      org.springframework.web.context.ContextLoader :345  | Root WebApplicationContext: initialization completed in 15109 ms</span><br><span class="line">2020-01-06 19:35:57.495 | INFO  --- [RMI TCP Connection(3)-127.0.0.1] |   o.s.web.context.support.XmlWebApplicationContext :982  | Closing Root WebApplicationContext: startup date [Mon Jan 06 19:35:42 CST 2020]; root of context hierarchy</span><br><span class="line">06-Jan-2020 19:35:57.546 WARNING [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web application [ROOT] registered the JDBC driver [net.sf.log4jdbc.DriverSpy] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.</span><br><span class="line">06-Jan-2020 19:35:57.546 WARNING [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web application [ROOT] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.</span><br><span class="line">[2020-01-06 07:35:57,595] Artifact dudu-erp-admin:war exploded: Error during artifact deployment. See server log for details.</span><br></pre></td></tr></table></figure>


<p>可以看到日志中并没有错误信息，只是报了一个数据库JDCB驱动相关的警告，期初以为是因为打开的软件太多，系统内存不够，然后关闭了很多软件再次尝试仍然是报这个信息，然后又尝试了一波玄学操作：<strong>重启电脑，删除项目中的<code>.idea</code>文件夹和<code>*.iml</code>文件后再重启项目</strong>，这种做法一般在idea出现bug的时候可以解决，但是在这里问题还是无法解决。</p>
<p>在尝试了几种解决办法后仍然不能正常启动，就又从新从上往下看了遍日志，发先了两行藏在<code>info</code>日志中间的红色日志<br><img src="https://s2.ax1x.com/2020/01/06/lykCwV.png" alt="lykCwV.png"></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">06-Jan-2020 19:35:57.481 SEVERE [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal One or more listeners failed to start. Full details will be found in the appropriate container log file</span><br><span class="line">06-Jan-2020 19:35:57.484 SEVERE [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal Context [] startup failed due to previous errors</span><br></pre></td></tr></table></figure>

<p>到这里错误信息就稍微明了一些了，说是<strong>因为一个或多个侦听器无法启动导致的错误，详细日志需要查看容器日志文件。</strong>  看到这里就打开了Tomcat的<code>catalina.2020-01-06.log</code>和<code>localhost.2020-01-06.log</code> 进行查找，然后在<code>localhost*.log</code>日志中找到了错误信息:</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">org.apache.catalina.core.StandardContext.listenerStart Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener</span><br><span class="line"> java.lang.IllegalStateException: Cannot initialize context because there is already a root application context present - check whether you have multiple ContextLoader* definitions in your web.xml!</span><br><span class="line">	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:297)</span><br><span class="line">	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)</span><br><span class="line">	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4738)</span><br></pre></td></tr></table></figure>

<p>经过检查日志发现，是因为我之前为了处理区分项目线上线下环境时继承重写了<code>org.springframework.web.context.ContextLoaderListener</code>监听，在<code>web.xml</code>中配置时加入自己重写过的<code>listener</code>后，没有删除<code>ContextLoaderListener</code>监听导致的，删除后即可正常启动项目</p>

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